Trimming mechanism for sewing machines



Jan 16, 1951 G. M. REIMER ET AL 2,538,272

TRIMMING MECHANISM FOR SEWING MACHINES Filed Nov. 2, 1949 5 Sheets-Sheet l I INVENTORS.

6 GEORGE SAUER GEORGE M. REIMER 1951 G. M. REIMER ET AL 2,538,272

TRIMMING MECHANISM FOR SEWING MACHINES Filed Nov. 2, 1949 5 Sheets-Sheet 2 I! 94 90 FIGS INN INVENTORS iii llll GEORGE SAUER 92 GEORGE M. REIMFR ATTORNEX Jan. 16, 1951 G. M. REIMER ET AL 2,538,272

TRIMMING MECHANISM FOR SEWING MACHINES Filed Nov. 2, 1949 5 Sheets-Sheet 3 FIGS 55 l9 l5 I8 35 73 so 2 33 3 3 72/ v 30 ATTORNEY G. M. REIMER ET AL TRIMMING MECHANISM FOR SEWING MACHINES Jan. 16, 1951 5 Sheets-Sheet 4 Filed Nov. 2, 1949 FIG. 1'

IN VEN TORS GEORGE SAUER GEORGE M. REIMER ATTORNEY.

Jan. 16, 1951 G. M. REIMER ET AL 2,538,273

TRIMMING MECHANISM FOR SEWING MACHINES Filed NOV. 2, 1949 5 Sheets-Sheet 5 INVENTORS. GEORGE SAUER GEORGE M. RE IMER BY a ATTORNEY.

Patented Jan. 16, 1951 TRIMMING MECHANISM FOR SEWING MACHINES George M. Reimer, Oak Park, and George Sauer,

Berwyn, Ill., assignors to Union Special Machine Company, Chicago, 111., a corporation of Illinois Application November 2, 1949, Serial No. 124,994

16 Claims. (Cl. 112-122) This invention relates to sewing machines, and more particularly to an improved trimming mechanism for such machines, whereby machines equipped therewith are capable of simultaneously seaming and trimming the edges of two or more Another object of the invention is to provide a sewing machine trimming mechanism that includes a conveniently located arrangement of devices for rendering the mechanism inoperative regardless of whether the sewing machine is in or out of active service.

Another object of the invention is to so arrange the parts of a sewing machine trimming mechanism that the possibility of binding action between such parts and associated parts of the sewing machine, in the course of placing the trimming mechanism in active service, is minimized.

A further object of the invention is to provide a trimming mechanism that is adapted to be driven from within the hollow head of a sewing machine and that is adapted to be placed into active service by an improved means, the major portion of which is positioned within the sewing machine head.

A still further object of the invention is to H provide a sewing machine trimming mechanism that is compact and sturdy in construction, positive in operation and capable of performing its intended functions in an efilcient and troublefree manner.

The trimming mechanism of this invention is intended for use and may be advantageously employed with conventional sewing machines, including lock-stitch sewing machines of the type including a frame comprising a base, a hollow standard extending upwardly from the base and a hollow arm overhanging the base and terminating in a hollow head. Such a machine generally includes a rotary drive shaft for imparting reciprocation to the usual needle bar positioned in the head and carrying a needle at its lower end.

In accordance with this invention, a stationary of the hollow head and serves as the lower bushing for a presser bar having a flange or circular head at its lower end. The tubular element also serves as the sole bushing for a sleeve that is positioned intermediate the tubular element and the portion of the presser bar above its head. This portion of the presser bar is of lesser diameter than the irmer diameter of the sleeve so that these parts define an angular space and are out of direct contact, thereby minimizing the possibility of binding action between the parts at such times as the sewing machine operator manually moves the sleeve with respect to the presser bar. Secured to the lower end of the sleeve is a vertically and horizontally adjustable trimming knife blade that is reciprocable with the sleeve. The knife blade is ofiset from the sleeve and the presser bar through the medium of a laterally extending arm that is preferably integral with the sleeve and projects through a slot in the lower end of the tubular element.

' Reciprocation is imparted to the sleeve by an arrangement of devices that are responsive to rotary movement of the drive shaft. This arrangement of devices preferably comprises a rock shaft supported at the rear of the sewing machine head and elements for translating rotational movement of the drive shaft into oscillatory movement of the rock shaft. An arm is attached to and is oscillatable with the rock shaft. This arm supports a latch that is adapted to be readily placed into and out of operative engagement with the sleeve.

When the latch is in operative engagement with the sleeve, the sewing machine may be used for simultaneously stitching together and trimming the marginal portion of a plurality of plies of fabric. If desired, the machine may be used to carryout only its normal stitching operations by simply disengaging the latch from the sleeve. Such disengagement is obtained by moving a plunger that is normally out of engagement with the latch into engagement with the latch and actuating the latch in a manner to release it from the sleeve. The latch and plunger are so arranged that the latch may be readily disengaged from the sleeve, whether the sewing machine is running or is at rest.

When it is desired to effect reengagement between the latch and the sleeve to thereby permit simultaneous stitching and trimming, the operator merely actuates a lever that is pivotally mounted within the head, whereby the sleeve is moved to a position where the latch operatively tubular element is mounted in the bottom wall engages the sleeve.

The foregoing objects, together with other objects, as well as the advantages obtainable by the practice of this invention, will be readily understood by persons skilled in the art upon reference to the following detailed description, taken in conjunction with the annexed drawings, which respectively describe and illustrate preferred arrangements of devices embodying the invention.

In the drawings:

Figure l is a view in end elevation of a sewing machine equipped with apparatus embodying the invention, the cover plate and associated parts being removed for better illustration of devices positioned wholly or partly within the head of the machine;

Figure 2 is a view in front elevation of the forward portion of the sewing machine shown in Figure 1;

Figure 3 is a longitudinal cross-sectional View through the sewing machine head shown in Figure 2;

Figure 4 is a view in elevation of the free end of the sewing machine head, the cover plate being broken away and shown partly in section, and certain parts being shown in another relative position from that shown in Figures 1 and 2;

Figure 5 is a view in rear elevation of the cover plate and devices mounted thereon;

Figure 6 is a view in side elevation of a lever for effecting operative engagement of th trimmer mechanism with other parts; a

Figure '7 is a fragmentary view, partly in vertical cross section, of a portion of Figure 4;

A Figure 8 is a view taken along line 88 of Figure 7 v Figure 9 is a view taken along line 99 of Figure 4; and

Figure 10 is ayiew in front elevation of a leaf spring shown in Figure 9 and in other views.

Referring now to the drawings wherein like reference numerals denote corresponding parts throughout the several views, a sewing machine frame, generally indicated by numeral l5, includes a base 16, a hollow standardll extending upwardly from the base, and a hollow arm 18, overhanging the base and terminating in 'a hollow head I 9. A cover plate 26, removably attachedto the head by a pair of screws 2|, permitsof ready access to the interior o f the head. The sewing machine has a horizontal rotary drive shaft 22, the inner end of which terminates in head i9, and carries a crank head 23 that coacts with link 2-1 in response to rotation of the shaft to impart reciprocation to a vertically disposed'reciproc'able needle bar 25 As is indicated in Figure 1, the needle bar is positioned in coaxial upper and lower bushings 25 and 21, respectively, that are carried by head [9. A needle 28 is attached to the lower end of the needle bar in the usual manner. The parts are so arranged as to obtain one complete reciprocation of the needle for each revolution of drive shaft 22. The illustrated sewing machine includes a take-up 29 which may be thesame as or similar to the take-up disclosed in G. Sauer Patent 2,324,598, entitled Sewing Machineff to which reference may be had for details of construction and operation in this regard.

Mounted in the bottom wall of hollow head I9 is a vertically arranged stationary bushing element 30 that is slotted as indicated at 3| in Figures '7 and 8. A knife holder sleeve 32 is reciprocable in bushing 30 and is cut away at its upper end to define a slot or aperture 33 (Figures 3 and 4) Sleeve'32 is provided at its lower end with an integral lateral extension '34 that projects 4 a. through slot 3% in bushing 30. A stop collar 35 (Figures 4 and 7) is affixed to the upper end of sleeve 32 by a pair of set screws 36 and 3'! and is formed with a laterally projecting bifurcated guide arm 38. This arm registers with a vertical slot (not shown) in the rear wall of hollow head is and is slidable along the path defined thereby to permit vertical reciprocatory movement of sleeve 32 but prevent angular movement of the sleeve about its axis. A spring 49 is connected at its lower end to set screw 31 and at its upper end to a pin stud All carried by and projecting laterally inwardly from the rear wall of the hollow head. Spring iil is stressed in tension and normally urges sleeve 32 and the devices attached thereto in an upward direction.

A bracket 42 having an elongated horizontal slot 43 is attached to sleeve extension 34 by screws it. This slot and screw arrangement permits of ready horizontal adjustment of the bracket with respect to the sleeve. A trimming knife blade 55 is formed with a vertical slot 48 and is attached to bracket 62 by a pair of screws d1. Slot 46 and screws 3? permit of ready vertical adjustment of knife blade with respect to sleeve 32. A handle or finger piece 48 is attached to sleeve extension 34 by a screw 49 and is disposed in spaced relation to the side of knife blade 45 remote from needle 2-8.

Coaxial with sleeve 32 and bushing element 30 is a presser bar 59 having an integral annular flange or head 5!. It will be apparent from an examination of Figure 7 that element 30 serves as the lower bushing for the presser bar as well as the sole bushing for sleeve 32. The portion of the presser bar above head 5! is of a lesser diameter than th inner diameter of sleeve 32 so that these elements define an annular space 52 and are out of direct contact, thereby minimizing the possibility of any binding action between the parts at such times as the sewing machine operator urges sleeve 36 into operative position, as will be described further along herein. A presser foot 53 is removably attached to the lower extremity of th presser bar by a screw 54.

The upper portion of the presser bar is positioned in a stationary upper presser bar bushing 55 that threadedly engages the top wall of hollow head l9 and that has a knurled head 56 to facilitate adjusting the loading on a compression spring 51. This spring is coaxial with the presser bar and bears at one end against the lower extremity of bushing 55 and at its other end against a collar 58 (Figure 1) that embraces the presser bar and is secured thereto by a set screw 59. It will be evident from an examination of Figure 1 that spring 57 normally and yieldingly urges the presser bar and its presser foot downwardly with respect to the sewing machine head. 'A laterally extending arm 65 is integral with collar 58 and registers with and is adapted to ride along the path defined by a vertical slot (not shown) in the rear wall of head l9 to prevent angular movement of the presser bar and the presser 'foot about the axis of the presser bar. Pivotally connected to arm 60 is a slotted link '6! that cooperates with a pin 62 and an arrangement of devices (not shown) to effect raising of the presser bar and the presser foot against the action of spring 51, whereby a piece of Work may be readily inserted in or removed from the sewing machine in the usual manner.

Reference is next had to Figures 1-4 for an understanding of a mechanism or means that is responsive to rotary movement of drive shaft 22 for imparting reciprocatory movement to sleeve 32 and, consequently, to knife blade 45. This means includes a pitman 63 having a relatively large strap 64 that embraces an eccentric 65 which is secured to and rotatable with the drive shaft. The pitman extends through an opening 65 (Figure 3) in the rear wall of head 19 and is provided with a relatively small strap (not shown) that is connected to a bolt 61. This bolt couples the pitman to a connector 68 that has an elongated arcuate adjusting slot 69. Connector 68 is secured to a horizontal rock shaft 18.

The rock shaft carries an integral arm 7| which has an inwardly projecting extension I2 having a bore '83 parallel to the axis of the rock shaft. A leaf spring is secured at one end to arm H by screws 16. The free end 11 of this spring is curved outwardly to obtain a camming surface 18 (Figure 9). Attached to the leaf spring by a screw 19 is a pin or plunger 80 that is slidable in bore l3. Pin 88 is normal to the axis of sleeve 32 and is adapted to register with sleeve slot 33 (Figure 9), or ride along the outer vertical surface of the sleeve, depending upon the vertical position of the sleeve with respect to the pin. The arrangement of leaf spring 15 and pin 89 may be considered as constituting a latch for releasably connecting the trimmer driving devices to sleeve 32.

There is best shown in Figure 4 an arrangement of devices for moving pin 88 out of registry with slot 33 and thereby effecting disconnection between the pin and sleeve 32, whether the sewing machine is in or out of active service. In this connection, cover plate is provided with a drill hole 81 and a recess 82. A plunger 83 is reciprocable in drill hole SI and is formed with a conical inner end 84 and a flange 85 that limits movement of the plunger toward the right as viewed in Figure 4. A hollow head or push button 86 is removably attached to the outer end of plunger 83 and is accommodated in recess 82. A helical compression spring 81 is coaxial with plunger 83 and bears at its opposite ends against push button 85 and the portion of cover plate 2|] at the juncture of drill hole 8! and recess 82 to normally and yieldingly urge the plunger toward the right as viewed in Figure 4, to the extent allowed by flange 85. Plunger 83 is normal to pin 89 and is adjacent to but normally out of engagement with free end Tl of leaf spring 15. It will be apparent from an examination of Figures 4 and 9 that when push button 86 is depressed, plunger 83 is moved toward the left and the conical inner end of the plunger bears against camming surface I8 of the spring with theresult that the inner portion of the spring is cammed away from arm H, and pin 88 is retracted from sleeve slot 33.

Also mounted on cover plate 20 is an improved means for moving sleeve 32 downwardly, when it is operatively disengaged from pin 89; to a position where it is operatively engaged by the pin. This means includes a lever 90 pivoted to the inner face of cover plate 28 by a screw 9| (Figure 5) and having an actuating curved end 92 that projects through an opening 93 in the cover plate. Lever 9D is formed at its other end with a lateral extension 94 and projects into the space between collars 35 and 58. A spring 95 is connected at one end to extension 94 and at its other end to a pin 93 secured to the cover plate and normally maintains lever 98 in the position shown in Figures i and 5. At such times as sleeve 32 is out 7 of operative engagement with pin 80, counter clockwise pivotal movement of lever 90 about screw 9|, as viewed in Figure 4, brings extention 94 into engagement with the upper end of collar 35 and moves sleeve 32 downwardly against the action of spring 49 until pin 89 registers with sleeve slot 33.

For the purpose of outlining the mode of operation of the illustrated embodiment of the invention, it is assumed that the sewing machine is assembled and that the parts are in the relative position shown in Figures 1, 2 and 3, with pin 88 in registry with slot 33 of sleeve 32. Upon rotation of drive shaft 22, needle bar 25 and needle 28 are reciprocated in the usual manner. Simultaneous with reciprocation of the needle, the drive shaft coacts with eccentric 65, pitman 63, connector 68, rock shaft 10, arm H and pin 80 to impart corresponding reciprocation to sleeve 32 and trimming knife blade 45. This permits of concurrent stitching and trimming of plies of fabric passed through the machine.

At such times as it may be desired to carry out only normal stitching operations, knife blade 45 may be readily placed out of service by merely depressing push button 86 which cams thelfree end of spring away from member ll, thereby withdrawing pin 8% from slot 33. Sleeve 32 and the trimming knife blade are thereupon moved upwardly by spring 48 to the position shown in Figure 4. Push button 86 is then released permitting leaf spring 75 to urge pin inwardly. The pin will not, however, reenter the slot since the slot will have been moved upwardly to a point where it is unable to receive the pin.

When it is desired to again place the trimming mechanism in active service, the operator stops the sewing machine, grips curved end 92 of lever and swings this lever in a counter-clockwise direction as viewed in Figure 4. This causes lever extension 94 to bear against the upper end of collar 35 and move this collar and sleeve 32 downwardly a sufficient extent to permit pin 88 to reenter slot 33. If desired, the sleeve and devices carried thereby may be moved downwardly into pin-reengaging position by actuating finger piece 48. It is recommended that lever 98 be used instead of finger piece 48 as this lever imparts a more direct downward thrust to the sleeve and minimizes the possibility of creating binding action between the sleeve and bushing element 39.

From the foregoing, it is believed that the construction, operation, and advantages of our present invention will be readily comprehended by persons skilled in the art. It is to be clearly understood, however, that the form of our invention herewith shown and described is to be taken as a preferred example of the same and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of our invention as defined by the-appended claims.

We claim: 7

1. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically arranged bushing carried by and extending below the bottom wall of the head, a presser bar reciprocable in the bushing, a sleeve coaxial with the bushing and reciprocable therealong, said sleeve being disposed intermediate the presser bar and the bushing, a trimming knife blade secured to the sleeve and reciprocable therewith, and means responsive to rotary movement of the drive shaft 7 for imparting corresponding reciprocatory movement to the sleeve.

2. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically arranged bushing carried by and extending below the bottom wall of the head, a presser bar reciprocable in the bushing, a sleeve coaxial with the bushing and reciprocable therealong, said sleeve being disposed intermediate a portion of the presser bar and the bushing and being spaced from said portion of the presser bar, a trimming knife blade secured to the sleeve and reciprocable therewith, and means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve.

3. In a sewing machine having an overhanging arm, alhollow head at the outer end of the arm, and a rotary drive shaft, a vertically arranged stationary bushing carried by and extending below the bottom wall of the head, a presser bar reciprocable in the bushing, a sleeve coaxial with the bushing and reciprocable therealong, said sleeve being disposed intermediate a portion of the presser bar and the bushing and being spaced from said portion of the presser bar, a trimming knife blade secured to the sleeve and reciprocable therewith, and oscillatory means independent of the presser bar engaging the drive shaft and the sleeve for translating rotary movement of the drive shaft into reciprocatory movement of the sleeve.

4. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically arranged stationary bushing carried by and extending below the bottom wall of the head, a presser bar reciprocable in the bushing and including a portion of reduced diameter spaced from the bush-- ing, a sleeve coaxial with the bushing and re ciprocable therealong, said sleeve being disposed intermediate said portion of the presser bar and the bushing and being spaced from said portion of the presser bar, a trimming knife blade secured to the sleeve and reciprocable therewith, and oscillatory means independent of the presser bar engaging the drive shaft and the sleeve for translating rotary movement of the drive shaft into reciprocatory movement of the sleeve.

5. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said means including an oscillatory member and a latch comprising a springpressed pin carried by the oscillatory member and releasably engaging the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin.

6. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said means including an oscillatory member and a latch comprising a spring-pressed pin carried by the oscillatory member and releasably engaging the sleeve, means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin, resilient means for normally urging the plunger in one direction to maintain the same out of engagement with the latch, and means for moving the plunger in the opposite direction against the action of the resilient means to actuate the latch in a manner to effect operative disengagement of the latch with respect to the sleeve.

7. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said means including an oscillatory member and a latch comprising a pin slidable with respect to the member along a path generally normal to the oscillatory path of the member, and a spring secured to the member and to the pin at spaced points, said spring urging the pin in one direction to maintain the same in operative engagement with the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin.

8. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said means including an oscillatory member and a latch comprising a pin slida'ble with respect to the member along a path generally normal to the oscillatory path of the member, a spring secured to the member and to the pin at spaced points, said spring urging the pin in one direction to maintain the same in operative engagement with the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin, resilient means for normally urging the plunger in one direction to maintain the same out of engagement with the latch, and means for moving the plunger in the opposite direction against the action of the resilient means to actuate the latch in a manner to effect operative disengagement of the latch with respect to the sleeve.

9. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said means including an oscillatory member and a latch comprising a pin slidable with respect to the member along a path generally normal to the oscillatory path of the member, a spring having a free end and secured at its other end to the member, said spring being secured to the pin intermediateits ends and urging the pin in one direction to maintain the same in operative engagement with the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin.

10. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said meansincluding an oscillatory member and a latch comprising a pin slidable with respect to the member along a path generally normal to the oscillatory path of the member, a spring having a free end and secured at its other end to the member, said spring being secured to the pin intermediate its ends and urging the pin in one direction to maintain the same in operative engagement with the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin, resilient means for normally urging the plunger in one direction to maintain the same out of engagement with the latch, and means for moving the plunger in the opposite direction against the action of the resilient means to actuate the latch in a manner to effect operative disengagement of the latch with respect to the sleeve.

11. In a sewing machine having an overhan ing arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, resilient means for normally and yieldingly urging the sleeve upwardly with respect to the presser bar, a lever pivotally mounted within the head and operable from theexterior thereof for imparting downward movement to the sleeve against the action of the resilient means, and means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve.

12. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, resilient means for normally urging the sleeve upwardly with respect to the presser bar, a lever pivotally mounted within the head and movable into and out of engagement with the sleeve, spring means.

normally maintaining the lever out of engagement with the sleeve, said lever being operable from the exterior of the head for effecting engagement of the lever with the sleeve and imparting downward movement to the sleeve against the action of the spring means and the resilient means, and oscillatory means independent of the presser bar engaging the drive shaft and the sleeve for translating rotary movement of the drive shaft into reciprocatory movement of the sleeve.

13. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically arranged bushing carried by and extending below the bottom wall of the head, a presser barreciprocable in the bushing, a sleeve coaxial with the bushing and reciprocable therealong, said sleeve being disposed intermediate a portion of the presser bar and the bushing and being spaced from said portion of the presser bar, a trimming knife blade secured to the sleeve and reciprocable therewith, means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said means including an oscillatory member and a latch comprising a spring-pressed pin carried by the oscillatory member and releasably engaging the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and re-ciprocable along a path generally normal to the axis of the pin.

14. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically arranged bushing carried by and extending below the bottom wall of thehead, a presser bar reciprocable in the bushing, a sleeve coaxial with the bushing and reciprocable therealong, said sleeve being disposed intermediate a portion of the presser bar and the bushing and being spaced from said portion of the presser bar, a trimming knife blade secured to the sleeve and reciprocable therewith, resilient means for normally and yieldingly urging the sleeve upwardly with respect to the presser bar, a lever pivotally mounted within the head and operable from the exterior thereof for imparting downward movement to the sleeve against the action of the resilient means, and means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve.

15. In a sewing machine having an overhanging arm, a hollow head at the outer end of the arm, and a rotary drive shaft, a vertically reciprocable presser bar carried by the head, a vertically reciprocable sleeve coaxial with the presser bar and extending through the bottom wall of the head, a trimming knife blade secured to the sleeve and reciprocable therewith, resilient means for normally and yieldingly urging the sleeve upwardly with respect to the presser bar, a lever pivotally mounted within the head and operable from the exterior thereof for imparting downward movement to the sleeve against the action of the resilient means, and means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said means including an oscillatory member and a latch comprising a springpressed pin carried by the oscillatory member and releasably engaging the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin.

1.6. In a sewing machine having an overhanging arm, a hollow head at the outer .end of the arm, and a rotary drive shaft, a vertically arranged bushing carried by and extending below the bottom wall of the head, a presser bar reciprocable in the bushing, a sleeve coaxial with the bushing and reciprocable therealong, said sleeve being disposed intermediate a portion of the presser bar and the bushing and being spaced from said portion Of the presser .bar, a, trimming knife bladesecured to the sleeve and reciprocable therewith, resilient means for normally and yieldingly urging the sleeve upwardly with respect to the presser bar, a lever pivotally mounted within the head and operable from the exterior thereof for imparting downward movement to the sleeve against the action of the resilient means, and means responsive to rotary movement of the drive shaft for imparting corresponding reciprocatory movement to the sleeve, said lastmentioned means including an oscillatory member and a latch comprising a, spring-pressed pin carried by the oscillatory member and releasably engaging the sleeve, and means for placing the latch out of operative engagement with the sleeve comprising a plunger mounted on the head and reciprocable along a path generally normal to the axis of the pin.

GEORGE M. REIMER.

GEORGE SAUER.

No references cited. 

